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Are air ionisers safe in the UK?

Updated: 21 October 2026

You are asking if air ionisers are safe in the UK because a listing says ozone-free and a relative has asthma, a dog, or both. The useful answer is a limit, not a yes. An ioniser in this set is not a medicine, and a seller’s ozone sentence is not a measurement. The seven listings in the [ioniser comparison](/hub/cooling/ionizer) run from a £10.99 plug to a Winix at about £159. This page says what UK guidance lets you claim, what to refuse, and when to stop and get help. Peter F. checked those listings against public UK sources. This is not a clinical leaflet. A qualifying purchase can earn a commission at no extra cost to you.

You are asking if air ionisers are safe in the UK because a listing says ozone-free and a relative has asthma, a dog, or both. The useful answer is a limit, not a yes.

Our top picks

PTYcrazy PTYcrazy XY-03 plug-in ioniser, 2 pack

Best overall

PTYcrazy PTYcrazy XY-03 plug-in ioniser, 2 pack
5.5/10about £10.99
View offer
Winix Winix 5500-2

Rank 2

Winix Winix 5500-2
9.1/10about £159
View offer
MELEDEN MELEDEN GL2103 desktop HEPA ioniser

Best value

MELEDEN MELEDEN GL2103 desktop HEPA ioniser
7.5/10about £19.99
View offer
On this page
  1. 1.Ions, ozone, and the product that was removed
  2. 2.What UK guidance says
  3. 3.What these listings claim, and what they do not prove
  4. 4.Plugs, pets, and when to stop

Ions, ozone, and the product that was removed

An air ioniser charges particles. On the PTYcrazy, the listing says those particles then settle. On a Winix, PlasmaWave sits beside HEPA and carbon and can be switched off. On a Blueair, HEPASilent is a charge inside the filter. Ozone is a gas, not a synonym for ions. An ozone generator sold at 48,000 mg/h was removed from this set. This page will not tell you how to run one. HSE EH38 treats ozone generators used against smells as an employer’s assessment, not as a bedroom freshener. If a carton leads with milligrams per hour of ozone, put it back. Placement sits on how to use an air ioniser.

What UK guidance says

HSE EH38 gives a workplace exposure limit of 0.2 ppm over 15 minutes. That is occupational guidance, not a certificate for a domestic plug. The NHS Right Decisions pathway, quoting BTS/SIGN, says air ionisers are not recommended for asthma. Cochrane finds no recommendation against chronic asthma symptoms either. This site will not tell you an ioniser treats asthma, hay fever or COPD. NICE NG149 says reduce the source and ventilate when you cook, shower or spray. SAGE, on 4 November 2020, said air cleaning does not replace ventilation and did not recommend ion or plasma devices for occupied rooms unless safety and efficacy are shown. One Winix reviewer said parrot dander did not clear like ordinary dust.
PTYcrazy PTYcrazy XY-03 plug-in ioniser, 2 pack

Testsieger

PTYcrazy PTYcrazy XY-03 plug-in ioniser, 2 pack
5.5/10about £10.99
View offer

What these listings claim, and what they do not prove

The PTYcrazy says ozone-free, the MELEDEN says zero ozone, and the JINPUS says ozone-free and UV-C-free. No ozone test figure for those three is in the files, so those sentences are not lab results. Winix cites an under 0.05 ppm line from the California Air Resources Board. That is a US state board, not the HSE 0.2 ppm workplace figure. A 5500-2 review reported an unusual odour with PlasmaWave on, and that reviewer’s own reading mentioned small ozone emissions. That is not a measured concentration. Switch the stage off if you do not want it. UKCA on a Winix listing is a product mark, not an ozone assay. UK mains kit sits under the Electrical Equipment (Safety) Regulations 2016.

Plugs, pets, and when to stop

A mains unit for a UK socket should have a BS 1363 plug. Blueair and Winix are corded. The MELEDEN and JINPUS ship a USB lead and no wall charger. If the pins do not fit, do not force them. One of eight PTYcrazy reviews is from someone with COPD who tried to cancel. That is one warning, not a rate and not a diagnosis. Unplug and speak to a clinician. If someone is too breathless to talk, or has blue lips, use 999. Otherwise, for urgent advice, use NHS 111. Stop if a plug smells of burning, the pins are hot, or you see scorch marks. The types are sorted in the ioniser buying guide.

Common questions

Are air ionisers safe to leave on all night?
There is no single yes in this set. Some Winix buyers call sleep mode quiet, and some MELEDEN buyers use an 8-hour shut-off. A 5300-2 review says a light sensor drops PlasmaWave in the dark. Overnight use is the wrong test if you bought the unit as asthma treatment. If anyone wakes short of breath, switch it off and use NHS 111 or 999 as the symptoms demand.
Does ozone-free on the plug-in mean it was tested?
Not on the evidence in the file. The PTYcrazy, MELEDEN and JINPUS pages say ozone-free or zero ozone. None of them prints an ozone measurement next to that sentence. Treat it as a seller’s claim. The HSE figure you can actually cite, 0.2 ppm over 15 minutes, is a workplace exposure limit, not a pass mark these plugs have been shown to meet.
Will this treat my asthma or COPD?
No. Air ionisers are not recommended for the treatment of asthma on the NHS Right Decisions pathway, and Cochrane does not recommend them for chronic asthma symptoms. A COPD reviewer of the PTYcrazy objected to the product and tried to cancel. That single review is not a personal diagnosis for you, and it is a reason not to experiment. Speak to your clinician. Use 999 if breathing becomes an emergency.
Is PlasmaWave’s 0.05 ppm line a UK limit?
No. The under 0.05 ppm line associated with Winix is the California Air Resources Board, cited by the manufacturer. The UK workplace figure in EH38 is 0.2 ppm over 15 minutes, and it is not a certificate for the 5300-2 or the 5500-2. You can switch PlasmaWave off. One 5500-2 review mentioned an odd smell and the reviewer’s own note about small ozone emissions, which is not a lab result.
What plug should a mains unit have?
A BS 1363 plug for a UK socket, under the plugs and sockets rules that sit with UK electrical products. The corded Blueair and Winix units are the ones that should arrive ready for that socket. The USB cubes do not include a wall charger, so you are choosing the adaptor. If the PTYcrazy pins do not match a UK socket, do not file them down or force them. A hot or burning plug is a stop, not a setting to adjust.

Related pages

Ioniser vs HEPA filter

Ioniser

Best ioniser: who each amazon.co.uk listing is for

Ioniser buying guide: plug, desk cube or room unit

How to use an air ioniser: placement, runtime and cleaning

Sources

Public UK sources from the research digest, used for this page on 20 October 2026. Prices, stars and review counts are the amazon.co.uk figures in this comparison. Listing CADR, room and decibel figures were not treated as a lab test.

  1. HSE EH38: ozone workplace exposure (retrieved 20 October 2026)
  2. Electrical Equipment (Safety) Regulations 2016 (retrieved 20 October 2026)
  3. Plugs and Sockets etc. (Safety) Regulations 1994 (retrieved 20 October 2026)
  4. NICE NG149: indoor air quality at home (retrieved 20 October 2026)
  5. NHS Right Decisions: ionisers and asthma (retrieved 20 October 2026)
  6. SAGE EMG, 4 November 2020: air cleaning devices (retrieved 20 October 2026)
  7. Which?: how to buy an air purifier (retrieved 20 October 2026)
  8. Cochrane: ionisers for chronic asthma (retrieved 20 October 2026)